import * as React from 'react';
import { Button, Text, View } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';

function HomeScreen({ navigation }) {
  const [initialHeight, setInitialHeight] = React.useState(0);
  const [correctedHeight, setCorrectedHeight] = React.useState(0);

  return (
    <View
     onLayout={event => {
      const {x, y, width, height} = event.nativeEvent.layout;
      if (!initialHeight) {
        setInitialHeight(height)
      } else {
        setCorrectedHeight(height)
      }
     }}
     style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
      <Text style={{ fontSize: 20, lineHeight: 20 * 1.6, textAlign: 'center' }}>
        Initial height: <Text style={{ fontWeight: 'bold' }}>{initialHeight}</Text>{`\n`}
        Corrected height: <Text style={{ fontWeight: 'bold' }}>{correctedHeight}</Text>
      </Text>
    </View>
  );
}

const Stack = createNativeStackNavigator();

function MyStack() {
  return (
    <Stack.Navigator>
      <Stack.Screen name="Home" component={HomeScreen} />
    </Stack.Navigator>
  );
}

export default function App() {
  return (
    <NavigationContainer>
      <MyStack />
    </NavigationContainer>
  );
}